Background technique
With the development of our country's economy, people's lives level increasingly improves, automobile has become people's tripThe not retrievable vehicles, the safety problem of automobile also increasingly obtain the extensive concern of people.Wherein, automobile brake perfrmanceQuality is one of most important factor of safe driving, therefore is also the emphasis of automotive check diagnosis.Automobile has good brakingPerformance, an emergency situation is encountered, can turn danger into safety；In normally travel, average overall travel speed can be improved, to improve transportProduction efficiency, but existing automobile brake perfrmance all largely needs to be tested in actual place, by testing automobilePractical braking is carried out in the case where different road conditions environment, and is acquired data and analyzed, or by bench test come to systemDynamic device material object carries out the simulated experiment of 1:1 on inertial test table, due to its relative to constant speed and Cattell testing machine closer toThe actual use operating condition of brake(-holder) block, opposite road test experiment energy is more economical, efficiently acquires data, and therefore, bench test also becomesAutomobile factory, brake manufactory investigate the important means of the braking ability of automotive brake, this status are based on, to examinationTesting just is particularly important with the test specification of Appreciation gist and Performance evaluation criterion, and by existing test to automobileBrake performance evaluate inflexible, and efficiency is lower, and most bench test machines can only be by perseverance in the prior artInput control mode carries out bench test, but to be tested by specification under the control mode of perseverance input, needs to first pass throughBraking institute's measuring moment value is estimated several times, then adjusts input pressure again, and braking deceleration is made to reach requirement, but many institute's weeksKnow, the operating condition of brake be it is unstable, especially in the test failed and restored, so can make to advise using such methodThere are certain error between the controlling value that model requires, and must multiple abort, it is relatively complicated, therefore, need a kind of new vapourThe evaluation method and system of vehicle brake performance, to solve the above problems.
Summary of the invention
In view of this, the present invention provides a kind of brake performance evaluation method based on virtual road load-up condition and isSystem, to solve the above problems.
A kind of brake performance evaluation method based on virtual road load-up condition provided by the invention, it is characterised in that:Including
A. Virtual Reality Platform is constructed, the operating condition of simulated automotive when driving, the Virtual Reality Platform includes for emulatingThe Vehicle dynamics that simulated automotive drives and the road model for drive simulating road environment；
B. different road environments is simulated by road model, acquires the Vehicle dynamics output under corresponding environmentBrake signal；
C. by the brake signal, the performance of brake to be measured is evaluated.
Further, the step c is specifically included
C1. it is sent to testboard bay using the brake signal as boundary condition, brake to be measured is tested；
C2. the output signal of brake to be measured is acquired, and real-time transmission is to Virtual Reality Platform；
C3. Virtual Reality Platform is analyzed and processed actuator data, evaluates the braking ability of brake.
Further, the step a further includes Virtual Reality Platform described in the real roads information architecture by acquisition.
Further, the step a further includes during simulation, and stochastic simulation is for interfering driver's driving behaviorEmergency event, the emergency event include:
Vehicle emergency event: other vehicles for happening suddenly in simulating vehicle driving process influence the driving behavior of driverSituation；
Road emergency event: for the emergent driving behavior for influencing driver of road in simulating vehicle driving processSituation.
Further, the brake signal includes car speed, deceleration and braking moment signal；The brake to be measuredOutput signal includes the temperature of the initial speed of braking of brake, brake-pipe pressure, braking moment, brake drum or brake disc.
Further, the step c3 is specifically included:
Brake efficiency is evaluated by the average retardation rate of brake；
The stability of output braking moment is evaluated by the braking moment coefficient of stability；
Brake-fade and restorability are evaluated by fading rate and recovery rate；
Brake system response characteristic is evaluated by braking time；
Overall merit is carried out by braking ability of the in summary evaluation result to brake to be measured.
Further, the real roads information includes road width, the gradient, speed limit, distance and telecommunication flow information.
The present invention also provides a kind of brake performance evaluation systems based on virtual road load-up condition, including are used for mouldVirtual Reality Platform, acquisition module and the evaluation module of operating condition when quasi- running car；
The Virtual Reality Platform includes driving for the Vehicle dynamics of analogue simulation car steering and for simulatingSail the road model of different road environments；
The acquisition module is used to acquire the brake signal of the Vehicle dynamics output under corresponding environment；
The evaluation module is used to evaluate the performance of brake to be measured by the brake signal.
Further, the Virtual Reality Platform further include for simulate interference driver's driving behavior emergency event withMachine analog module.
It further, further include display module and the inertia testboard bay for being tested brake to be measured.
Beneficial effects of the present invention: the brake performance evaluation method based on virtual road load-up condition in the present invention,It is evaluated by brake performance of the Virtual Reality Platform to automobile, is limited by the field test process not, it can be with mouldNumerous stochastic events are drawn up, making test process very has real reference meaning, provides more to the exploitation and test of brakeFor accurate foundation.The present invention keeps test mode more flexible, reduces costs, and enormously simplifies brake bench test streamJourney improves the operability of test, improves the efficiency of test.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples: Fig. 1 is the principle of the present invention schematic diagram, Fig. 2It is structural schematic diagram of the invention.
As shown in Figure 1, the brake performance evaluation method based on virtual road load-up condition in the present embodiment, including
A. Virtual Reality Platform is constructed, the operating condition of simulated automotive when driving, the Virtual Reality Platform includes for emulatingThe Vehicle dynamics that simulated automotive drives and the road model for drive simulating road environment；
B. different road environments is simulated by road model, acquires the Vehicle dynamics output under corresponding environmentBrake signal；
C. by the brake signal, the performance of brake to be measured is evaluated.
In the present embodiment, the step c is specifically included
C1. it is sent to testboard bay using the brake signal as boundary condition, brake to be measured is tested；
C2. the output signal of brake to be measured is acquired, and real-time transmission is to Virtual Reality Platform；
C3. Virtual Reality Platform is analyzed and processed actuator data, evaluates the braking ability of brake.
In the present embodiment, the brake performance test that Combining with technology of virtual reality and hardware in loop simulation technique are builtPlatform.Full Vehicle Dynamics model and road model comprising brake are established using dynamics simulation, simulated automotive is braked when drivingOperating condition, generate automobile boundary conditions such as required braking deceleration, braking moment on real road, and by the perimeter stripPart is applied to brake rack, acquires brake temperature rise, braking moment, brake pressure, brake using data collection systemInformation, the brake testers such as abrasion can provide more accurate foundation for brake design.
In the present embodiment, the step a further includes that virtual reality described in the real roads information architecture by acquisition is flatPlatform.Real roads information includes road width, the gradient, speed limit, distance and telecommunication flow information etc., can pass through image capture deviceThe information of real roads is subjected to analogue simulation, makes test that more there is referential and practical significance.
It in the present embodiment, further include during simulation, stochastic simulation is used to interfere the prominent of driver's driving behaviorHair event, the emergency event include:
Vehicle emergency event: other vehicles for happening suddenly in simulating vehicle driving process influence the driving behavior of driverSituation；
Road emergency event: for the emergent driving behavior for influencing driver of road in simulating vehicle driving processSituation.
Increase Random Road emergency event when passing through simulation, further simulate the driving under real conditions, comprehensively considers eachBraking ability under the conditions of kind road conditions, comprehensive evaluation is carried out to braking ability, wherein the emergency situations of vehicle: such as front vehiclesThere is row human or animal etc. suddenly in emergency brake, unexpected lane change；The emergency situations of road: as having barrier, night in road suddenlyBetween situations such as road lighting is uneven, seep water in tunnel, chip off-falling.It can be simulated in real field test and be difficult to by chance eventThe various test environment built keep the result of test more accurate.
In the present embodiment, brake signal includes car speed, deceleration and braking moment signal；The brake to be measuredOutput signal include the initial speed of braking of brake, brake-pipe pressure, braking moment, brake drum or brake disc temperature.Driver can be according to the road information that display is shown to the steering wheel of driver's simulator, gas pedal and brake pedalBraked, after signal acquisition and processing subsystem collect the signal on driving simulator in respective sensor, using it asInput is sent in Vehicle dynamics, and replicating machine includes car speed, deceleration, system by the output of Vehicle dynamicsAfter kinetic moment signal is separately sent to the control system on test-bed, brake engine bench test system starts to test, measurementSystem is just (end) warm and real by initial speed of braking, brake-pipe pressure, braking moment, the brake drum (disk) for acquiring brakeWhen be transmitted to replicating machine, replicating machine is that data test the road conditions lower brake are analyzed and processed, and are provided test and brakedThe performance evaluation of device.
In the present embodiment, the step c3 is specifically included:
Brake efficiency is evaluated by the average retardation rate of brake；
The stability of output braking moment is evaluated by the braking moment coefficient of stability；
Brake-fade and restorability are evaluated by fading rate and recovery rate；
Brake system response characteristic is evaluated by braking time；
In the present embodiment, the performance that brake is evaluated by aforementioned four aspect, finally by summary evaluatingAs a result overall merit is carried out to the braking ability of brake to be measured.
It is commented as shown in Fig. 2, additionally providing a kind of brake performance based on virtual road load-up condition in the present embodimentValence system, Virtual Reality Platform, acquisition module, evaluation module display module including the operating condition for simulated automotive when driving andInertia testboard bay for being tested brake to be measured；
The Virtual Reality Platform includes driving for the Vehicle dynamics of analogue simulation car steering and for simulatingSail the road model of different road environments；
The acquisition module is used to acquire the brake signal of the Vehicle dynamics output under corresponding environment；
The evaluation module is used to evaluate the performance of brake to be measured by the brake signal.
In the present embodiment, the Virtual Reality Platform further includes the burst thing for simulating interference driver's driving behaviorThe stochastic simulation module of part.
It include road width, the gradient, speed limit, distance, friendship by display module by the collected traffic information of real roadsThe information such as through-flow are shown；Vehicle dynamics run constraint condition in Virtual Reality Platform by road of the traffic informationMiddle operation.
The present embodiment makees the Virtual Reality Platform built using Combining with technology of virtual reality and hardware in loop simulation techniqueFor brake performance testing stand, driver according to the road information of display to the steering wheel of driver's simulator, gas pedal andBrake pedal is braked, after signaling module collects the signal on driving simulator in respective sensor, using it as defeatedEnter to be sent in Vehicle dynamics, replicating machine includes car speed, deceleration, braking by the output of Vehicle dynamicsAfter torque signals are separately sent to the control system on test-bed, brake engine bench test system starts to test, measurement systemSystem is just (end) warm by initial speed of braking, brake-pipe pressure, braking moment, the brake drum (disk) for acquiring brake, and in real timeBe transmitted to replicating machine, the evaluation module in replicating machine is that the data tested the road conditions lower brake are analyzed and processed, and are givenThe performance evaluation of brake is tested out.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared withGood embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the inventionArt scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at thisIn the scope of the claims of invention.